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Amber
White
Red
Green
Explanation: The reflective studs between the carriageway and the hard shoulder are normally red. These change to green where there's a slip road. They help you identify slip roads when visibility is poor or when it's dark.
Category: Band 2 traffic signs and signals
References: The Official DVSA Guide to Driving: Section 11, Highway Code: Rule 132, Know Your Traffic Signs: Page 71
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